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aria-label="二、Vue基本使用"><!--[--><!--]--> 二、Vue基本使用 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111201" class="nav-link series-item" aria-label="表单"><!--[--><!--]--> 表单 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111201" class="nav-link series-item" aria-label="实操"><!--[--><!--]--> 实操 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111201" class="nav-link series-item" aria-label="其他"><!--[--><!--]--> 其他 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue_2022111301.html" class="nav-link series-item" aria-label="初始化Vue项目"><!--[--><!--]--> 初始化Vue项目 <!--[--><!--]--></a><!--]--></li></ul></section><!--]--><!--[--><section class="series-group series-item"><h5 class="series-heading active">Vue学习</h5><ul><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111201" class="nav-link series-item" aria-label="Vue2全家桶"><!--[--><!--]--> Vue2全家桶 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111201.html" class="nav-link series-item" aria-label="一、Vue概述"><!--[--><!--]--> 一、Vue概述 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111202.html" class="nav-link series-item" aria-label="二、Vue基本使用"><!--[--><!--]--> 二、Vue基本使用 <!--[--><!--]--></a><!--]--></li><li><!--[--><a aria-current="page" href="/blog/blogs/Vue/Vue2_2022111203.html" class="router-link-active router-link-exact-active nav-link router-link-active series-item active" aria-label="三、Vue模版语法"><!--[--><!--]--> 三、Vue模版语法 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111204.html" class="nav-link series-item" aria-label="四、Vue常用特性"><!--[--><!--]--> 四、Vue常用特性 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111205.html" class="nav-link series-item" aria-label="五、组件化开发"><!--[--><!--]--> 五、组件化开发 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111206.html" class="nav-link series-item" aria-label="六、前后端交互"><!--[--><!--]--> 六、前后端交互 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111207.html" class="nav-link series-item" aria-label="七、前端路由"><!--[--><!--]--> 七、前端路由 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111208.html" class="nav-link series-item" aria-label="八、前端工程化"><!--[--><!--]--> 八、前端工程化 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue2_2022111209.html" class="nav-link series-item" aria-label="九、其他"><!--[--><!--]--> 九、其他 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vuex_2022111301" class="nav-link series-item" aria-label="Vuex"><!--[--><!--]--> Vuex <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vuex_2022111301.html" class="nav-link series-item" aria-label="一、Vuex概述"><!--[--><!--]--> 一、Vuex概述 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vuex_2022111302.html" class="nav-link series-item" aria-label="二、Vuex的基本使用"><!--[--><!--]--> 二、Vuex的基本使用 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vuex_2022111303.html" class="nav-link series-item" aria-label="三、Vuex的核心概念"><!--[--><!--]--> 三、Vuex的核心概念 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue3_2022111301" class="nav-link series-item" aria-label="Vue3"><!--[--><!--]--> Vue3 <!--[--><!--]--></a><!--]--></li><li><!--[--><a href="/blog/blogs/Vue/Vue3_2022111301.html" class="nav-link series-item" aria-label="Vue3啦啦啦"><!--[--><!--]--> Vue3啦啦啦 <!--[--><!--]--></a><!--]--></li></ul></section><!--]--><!--]--></aside><!--[--><main class="page-container show-series show-catalog"><h1 class="page-title">三、Vue模版语法</h1><div class="page-info"><a class="icon-container left" href="javascript:void(0)" target="_self"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" 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xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" style="color:inherit;width:18px;height:18px;font-size:18px;"><path d="M5 4h4l3 3h7a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg><span style="color:inherit;font-size:14px;" class="icon-text"><!--[-->前端<!--]--></span></a><a class="icon-container left" href="javascript:void(0)" target="_self"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" style="color:inherit;width:18px;height:18px;font-size:18px;"><g fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="8.5" cy="8.5" r="1" fill="currentColor"></circle><path d="M4 7v3.859c0 .537.213 1.052.593 1.432l8.116 8.116a2.025 2.025 0 0 0 2.864 0l4.834-4.834a2.025 2.025 0 0 0 0-2.864L12.29 4.593A2.025 2.025 0 0 0 10.859 4H7a3 3 0 0 0-3 3z"></path></g></svg><span style="color:inherit;font-size:14px;" class="icon-text"><!--[-->Vue<!--]--></span></a><!----></div><div class="theme-reco-default-content"><div><h2 id="如何理解前端渲染" tabindex="-1"><a class="header-anchor" href="#如何理解前端渲染" aria-hidden="true">#</a> 如何理解前端渲染?</h2><ul><li>将数据填充到HTML标签中</li><li>前端渲染有几种方式呢? <ol><li>js字符串拼接-&gt;后期维护较难</li><li>使用后前端模板引擎-&gt;没有专门提供事件处理机制</li><li>Vue特有的模版语法</li></ol></li></ul><h2 id="模版语法概览" tabindex="-1"><a class="header-anchor" href="#模版语法概览" aria-hidden="true">#</a> 模版语法概览</h2><ol><li>差值表达式</li><li>指令</li><li>事件绑定</li><li>属性绑定</li><li>样式绑定</li><li>分支循环结构</li></ol><h3 id="_1-差值表达式" tabindex="-1"><a class="header-anchor" href="#_1-差值表达式" aria-hidden="true">#</a> 1.差值表达式</h3><blockquote><p><code>{{插值表达式}}</code></p></blockquote><ul><li>插值表达式存在的问题 👉 <strong>闪动</strong><ul><li>如何解决该问题 👉 <strong>v-cloak</strong></li><li>解决该问题的原理 👉 <strong>先隐藏.替换好值之后在显示最终的值</strong></li></ul></li></ul><h3 id="_2-指令" tabindex="-1"><a class="header-anchor" href="#_2-指令" aria-hidden="true">#</a> 2.指令</h3><blockquote><p>指令的本质就是自定义属性 指令的格式 是以v-开始 例如:<code>v-cloak</code></p></blockquote><ul><li><em>v-cloak</em> 指令用法 <ul><li><ol><li>提供样式 <em>[v-cloak]</em> <code>{display:none};</code></li></ol></li><li>2.在插值表达式所在的标签中添加 <em>v-cloak</em> 指令 <code>&lt;div v-cloak&gt;{{content}}&lt;/div&gt;</code></li></ul></li><li>数据绑定指令 <ul><li><em>v-text</em> 纯文本填充 : 相比差值表达式更简洁 没有闪动问题 <ol><li><code>&lt;div v-text=&#39;content&#39;&gt;&lt;/div&gt;</code></li></ol></li><li><em>v-html</em> 填充HTML片段 <ol><li>存在安全问题</li><li>本网站内部数据可以使用来自第三方的数据不可以用</li><li><code>&lt;div v-html=&#39;content&#39;&gt;&lt;/div&gt;</code></li></ol></li><li><em>v-pre</em> 填充原始信息 <ol><li>显示原始信息.跳过编译过程(分析编译过程) data里面是什么就显示什么 不编译</li><li><code>&lt;div v-pre&gt;{{content}}&lt;/div&gt;</code></li></ol></li></ul></li><li>数据响应式 <ul><li>如何理解响应式 ? <ul><li>html5中的响应式 <code>屏幕尺寸的变化导致样式的变化</code></li><li>数据的响应式 <code>数据的变化导致页面内容的变化</code></li></ul></li><li>什么是数据绑定? <code>数据绑定：将数据填充到标签中</code></li><li><em>v-once</em> <code>只编译一次.显示内容之后不再具有响应式功能</code><ul><li>应用场景：如果显示的信息后续不需要再修改.你们可以使用v-once.这样可以提高性能</li></ul></li></ul></li><li>双向数据绑定 <ul><li>什么是双向数据绑定？ <code>数据发生变化可以影响数据在其他dom中的变化</code></li><li>双向数据绑定分析： <code>v-model</code> + <code>&lt;input type=&quot;text&quot; v-model=&quot;data&quot;&gt;</code></li><li>MVVM设计思想： <ul><li><code>model</code>提供数据</li><li><code>view</code>模板 DOM 提供数据展示效果的</li><li><code>view-Model</code>实现控制逻辑.中介角色.链接<code>model</code>和<code>view</code>、通过DOM事件监听+数据绑定=双向绑定</li></ul></li></ul></li></ul><h3 id="_3-事件绑定" tabindex="-1"><a class="header-anchor" href="#_3-事件绑定" aria-hidden="true">#</a> 3.事件绑定</h3><ul><li>Vue如何处理事件？<code>methods</code>方法 、函数里用的<code>this</code>指的是<code>vue</code>的<code>实例对象</code><ul><li><em>v-on指令用法</em> <code>&lt;input type=&quot;button&quot; v-on:click=&quot;num&quot;&gt;</code></li><li><em>v-on简写形式</em> <code>&lt;input type=&quot;button&quot; @click=&quot;num&quot;&gt;</code></li></ul></li><li>事件函数的调用方式 <ul><li><em>直接绑定函数名称</em> <code>&lt;button type=&quot;button&quot; v-on:click=&quot;sum&quot;&gt;&lt;/button&gt;</code></li><li><em>调用函数</em> <code>&lt;button type=&quot;button&quot; v-on:click=&quot;sum()&quot;&gt;&lt;/button&gt;</code></li></ul></li><li>事件函数参数传递 <ul><li>如果事件直接绑定函数名称，那么默认会传递事件对象作为事件函数的第一个参数</li><li>如果事件绑定函数调用，那么事件对象必须作为最后一个参数显示传递，并且事件对象的名称必须是固定的 <em>$event</em><ul><li><em>普通函数和事件对象</em> <code>&lt;button v-on:click=&#39;num(&quot;hi,$event&quot;)&#39;&gt;&lt;/button&gt;</code></li></ul></li></ul></li><li>事件修饰符 <code>可以连写</code><ul><li><em>.stop阻止冒泡</em> <code>&lt;a v-on:click.stop=&quot;handle&quot;&gt;跳转&lt;/a&gt;</code></li><li><em>.prevent阻止默认行为</em><code>&lt;a v-on:click.prevent=&quot;handle&quot;&gt;跳转&lt;/a&gt;</code></li><li><em>.stop和.prevent 可以串联在一起写 表示既阻止了冒泡 又阻止了默认行为</em></li><li><em>.self 只在当<code>event.target</code>是当前元素自身时出发的处理函数</em></li><li><em>使用修饰符时，顺序很重要；相应的代码会以同样的顺序产生。因此，用<code>v-on:click.prevent.self</code> 会阻止所有的点击，而<code>v-on:click.self.prevent</code> 只会阻止对元素自身的点击。</em></li></ul></li><li>按键修饰符 <ul><li><em>.enter回车键</em> <code>&lt;input v-on:keyup.enter=&#39;submit&#39;&gt;</code></li><li><em>.delete删除键</em> <code>&lt;input v-on:keyup.delete=&#39;handle&#39;&gt;</code></li></ul></li><li>自定义按键修饰符 <ul><li><em>全局config.keyCodes对象 每一个按键都有一个keyCode</em></li><li><em>规则：自定义按键修饰符名字是自定义的，但是对应的值必须是按键对应event.keyCode值</em></li></ul></li></ul><div class="language-vue ext-vue line-numbers-mode"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">v-on:</span>keyup.aaa</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&#39;</span>handle<span class="token punctuation">&#39;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name"><span class="token namespace">v-on:</span>keyup.65</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&#39;</span>handle<span class="token punctuation">&#39;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    Vue<span class="token punctuation">.</span>cofig<span class="token punctuation">.</span>keyCode<span class="token punctuation">.</span>aaa <span class="token operator">=</span> <span class="token number">65</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_4-属性绑定" tabindex="-1"><a class="header-anchor" href="#_4-属性绑定" aria-hidden="true">#</a> 4.属性绑定</h3><ul><li>Vue如何动态处理属性 <ul><li><em>v-bind</em>指令用法 <code>&lt;a v-bind:href=&#39;url&#39;&gt;跳转&lt;/a&gt;</code></li><li><em>缩写形式</em> <code>&lt;a :href=&#39;url&#39;&gt;跳转 &lt;/a&gt;</code></li></ul></li><li><em>v-model</em> 的底层实现原理分析 <em>使用输入域中最新的数据覆盖原来数据</em><ul><li><code>&lt;input v-bind:value=&quot;msg&quot; v-on:input=&quot;msg=$event.target.value&quot;&gt;</code></li></ul></li></ul><h3 id="_5-样式绑定" tabindex="-1"><a class="header-anchor" href="#_5-样式绑定" aria-hidden="true">#</a> 5.样式绑定</h3><ul><li><em>class</em>样式处理 <ul><li><em>对象语法</em> <code>&lt;div v-bind:class=&quot;{active:isActive,class:isClass}&quot;&gt;&lt;/div&gt;</code></li><li><em>数组语法</em> <code>&lt;div v-bind:class=&quot;[class1,class2,class3]&quot;&gt;&lt;/div&gt;</code></li><li><em>数组语法 需要data{class:&#39;name&#39;},如果class1=&#39;&#39;则会去掉这个class名字</em><ul><li>对象绑定和数组绑定可以结合使用 <ul><li><code>&lt;div v-bind:class=&#39;[className1,className2,{className3:isClass3}]&#39;&gt;&lt;/div&gt;</code></li><li><em>class</em>绑定的值可以简化操作 <em>在data里面定义一个数组/对象 直接操作/赋值即可</em></li><li>默认的class如何处理？<em>会被保留直接写class里面即可</em></li></ul></li></ul></li></ul></li><li><em>style</em>样式处理 <ul><li><em>对象语法</em> <code>&lt;div V-bind:style=&quot;{ color: activecolor, fontSize: fontSize }&quot;&gt;&lt;/div&gt;</code></li><li><em>数组语法</em> <code>&lt;div V-bind:style=&quot;[style1,style2]&quot;&gt;&lt;/div&gt;</code><em>style1/2是覆盖的关系</em></li></ul></li></ul><h3 id="_6-分支循环结构" tabindex="-1"><a class="header-anchor" href="#_6-分支循环结构" aria-hidden="true">#</a> 6.分支循环结构</h3><ul><li>分之结构 <ul><li>v-if *控制元素是否渲染到页面 变化比较少 用 v-if 因为需要操作dom *</li><li>v-else</li><li>v-else-if</li><li>v-show <em>控制元素是否显示 （已经渲染到了页面）频繁切换显示/隐藏用</em></li></ul></li><li>循环结构 <ul><li>v-for 遍历数组 <ul><li><code>&lt;1i v-for=&#39;item in 1ist&#39;&gt;{{item}}&lt;/1i&gt;</code></li><li><code>&lt;1i v-for=&#39; (item, index) in list&quot;&gt;{{item}} + &#39;---&quot; +{{index}}&lt;/1i&gt;</code></li></ul></li><li>key的作用：帮助vue区分不同的元素，从而提高性能 <ul><li><code>&lt;1i :key=&#39;item.id&#39; v-for=&#39; (item, index) in list&#39;&gt;{{item}}{{index}}&lt;/1i&gt;</code></li></ul></li><li>v-for 遍历对象 <ul><li><code>&lt;span v-for=&quot;(value,key,index) in object&quot;&gt;&lt;/span&gt;</code> <em>简写vki</em></li></ul></li><li>v-if 和 v-for 结合使用 <em>不建议一起使用</em></li></ul></li></ul></div></div><footer class="page-meta"><div class="meta-item edit-link"><a class="icon-container left meta-item-label" href="https://gitee.com/i77ing/blog.git/edit/master/blogs/Vue/Vue2_2022111203.md" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" style="color:inherit;width:20px;height:20px;font-size:20px;"><g fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 7H6a2 2 0 0 0-2 2v9a2 2 0 0 0 2 2h9a2 2 0 0 0 2-2v-3"></path><path d="M9 15h3l8.5-8.5a1.5 1.5 0 0 0-3-3L9 12v3"></path><path d="M16 5l3 3"></path></g></svg><span style="color:inherit;font-size:14px;" class="icon-text"><!--[-->Edit this page<!--]--></span></a></div><div class="meta-item last-updated"><a class="icon-container left meta-item-label" href="javascript:void(0)" target="_self"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" style="color:inherit;width:20px;height:20px;font-size:20px;"><g fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M11.795 21H5a2 2 0 0 1-2-2V7a2 2 0 0 1 2-2h12a2 2 0 0 1 2 2v4"></path><circle cx="18" cy="18" r="4"></circle><path d="M15 3v4"></path><path d="M7 3v4"></path><path d="M3 11h16"></path><path d="M18 16.496V18l1 1"></path></g></svg><span style="color:inherit;font-size:14px;" class="icon-text"><!--[-->Last Updated 2023-02-23 19:57:37<!--]--></span></a></div></footer><nav class="page-nav"><p class="hasPrev hasNext inner"><span class="page-nav-item prev"> ← 二、Vue基本使用</span><span class="page-nav-item next">四、Vue常用特性 → </span></p></nav><!----></main><!--]--><div class="page-catalog-container"><h5 class="tip">ON THIS PAGE</h5><ul><!--[--><!--[--><li class="page-catalog-menu-depth_2"><a aria-current="page" href="/blog/blogs/Vue/Vue2_2022111203.html#如何理解前端渲染" class="router-link-active router-link-exact-active nav-link page-catalog-item" aria-label="如何理解前端渲染?"><!--[--><!--]--> 如何理解前端渲染? 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